In Starting Real Application Clusters Database, We will also follow a set of sequence. The order will be just opposite to Shutting down the Real Application Clusters Database.
1. Start Oracle Clusterware or CRS.
2. Start Node applications running on nodes.
3. Start All ASM instances from all nodes.
4. Start RAC Database Instances on all nodes.
5. Start Oracle Home process accessing database.
1. Start Oracle Clusterware or CRS:
CRS
starts automatically when you start or restart Server, but Here DBA has
manually shutdown the CRS So, he has to start it manually. This is the only
command which needs to be executed by "root"
user. Database Administrator should execute this command on all nodes.
[root@node1
bin]# crsctl start crs
CRS-4123:
Oracle High Availability Services has been started
[root@node2
bin]# crsctl check cluster -all
**************************************************************
node1:
CRS-4535:
Cannot communicate with Cluster Ready Services
CRS-4529:
Cluster Synchronization Services is online
CRS-4533:
Event Manager is online
**************************************************************
node2:
CRS-4537:
Cluster Ready Services is online
CRS-4529:
Cluster Synchronization Services is online
CRS-4533:
Event Manager is online
**************************************************************
Here, DBA can see "CRS-4639: Could not contact Oracle High Availability Services" or "CRS-4535: Cannot communicate with Cluster Ready Services" messages. Wait 5 minutes and then again check with "crsctl check cluster -all" command. This time Database administrator will get "CRS-4537: Cluster Ready Services is online". If still same issue DBA can start ora.crsd process to resolve this issue. Below is the command
[root@node1
bin]# crsctl start res ora.crsd -init
[root@node1
bin]# crsctl check cluster -all
**************************************************************
node1:
CRS-4537:
Cluster Ready Services is online
CRS-4529:
Cluster Synchronization Services is online
CRS-4533:
Event Manager is online
**************************************************************
node2:
CRS-4537:
Cluster Ready Services is online
CRS-4529:
Cluster Synchronization Services is online
CRS-4533:
Event Manager is online
**************************************************************
Now, Cluster is up and running. DBA can also use "ps -ef | grepd.bin" to check cluster status.
2.
Start Node applications running on nodes:
To
start node applications running on a node, enter the following command, where
node is the name of the node where the applications are running
[grid@node1
bin]$ srvctl start nodeapps -n node1
[grid@node1
bin]$ srvctl status nodeapps -n node1
VIP
node1-vip is enabled
VIP
node1-vip is running on node: node1
Network
is enabled
Network
is running on node: node1
GSD
is disabled
GSD
is not running on node: node1
ONS
is enabled
ONS
daemon is running on node: node1
DBA has to execute this command for each node to start Real Application Clusters Cluster database.
3. Start All ASM instances from all nodes:
Next
DBA has to start all ASM instances which are used to access database, enter the
following command, where node is the name of the node where the ASM instance has
to start.
[grid@node1
bin]$ srvctl start asm -n node1
[grid@node1
bin]$ srvctl status asm -n node1
ASM
is running on node1
DBA has to start ASM instance on all database nodes.
4.
Start RAC Database Instances on all nodes:
Now,
We will start database instances on database nodes to access data.
[grid@node1
bin]$ srvctl start database -d oradb
[grid@node1
bin]$ srvctl status database -d oradb
Instance
oradb1 is running on node node1
Instance
oradb2 is running on node node2
Now database is up and running on both DB nodes.
5.
Start Oracle Home process accessing database:
let's
start listener and OEM to access database and allow users to connect to the
database.
[grid@node1
bin]$ srvctl start listener -n node1
[grid@node1
bin]$ srvctl status listener -n node1
Listener
LISTENER is enabled on node(s): node1
Listener
LISTENER is running on node(s): node1
[oracle@database
~]$ emctl start dbconsole
Oracle
Enterprise Manager 11g Database Control Release 11.2.0.2.0
Copyright
(c) 1996, 2010 Oracle Corporation. All rights reserved.
https://database.example.com:5500/em/console/aboutApplication
Starting
Oracle Enterprise Manager 11g Database Control ..........................
.
started.
------------------------------------------------------------------
Logs
are generated in directory
/etc/oracle/oracle/database.example.com_orcl/sysman/log
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